If GDP increases,

A) real GDP must remain constant.
B) real GDP will increase only if the inflation rate is higher than the rate of increase in GDP.
C) real GDP must decrease.
D) real GDP must increase.
E) real GDP could increase,decrease,or remain the same.

Real GDP adjusts for inflation, so if nominal GDP increases, real GDP could increase, decrease, or remain the same depending on how prices have changed. If prices have increased faster than nominal GDP, real GDP could decrease; if prices have increased slower than nominal GDP, real GDP could increase; if prices have remained constant, real GDP would increase at the same rate as nominal GDP.